HomeMy WebLinkAbout5.10_PC-10_Noise_AssessmentAttachment No. PC 10
May 21, 2012 Mestre Greve Associates
Noise Assessment
«_
NOISE ASSESSMENT FOR
MARINERS POINTE
CITY OF NEWPORT BEACH
REPORT #529101NO2
MAY 211, 2012
PREPARED FOR:
STOUTENBOROUGH,INC.
420 Alta Vista Way, Suite 100
Laguna Beach, CA. 92651
PREPARED BY:
MLeff
MESTRE GREVE ASSOCIATES
DIVISION OF LANDRUM & BROWN
27812 El Lazo Road
Laguna Niguel, CA 92677
949 - 349 -0671
Fred Greve, P.E.
Matthew B. Jones, P.E.
Mestre Greve Associates
Division of Landrum & Brown
TABLE OF CONTENTS
Mariner's Pointe
Page i
Listof Tables ............................................................... ............................... ii
Listof Figures ............................................................. ............................... ii
1.0 Introduction ............................................................ ..............................1
2.0 Existing Setting .................................................... ............................... 4
2.1 Background Information on Noise ................................... ..............................4
2.1.1 Noise Criteria Background
2.1.2 Noise Assessment Metrics
4
5
2.2 Noise Criteria ...................................................................... ..............................6
2.2.1 City of Newport Beach Noise Element .........
2.2.2 City of Newport Beach Noise Ordinance.....
2.3 Existing Noise Measurements ......................................... .............................10
3.0 Compliance Analysis ........................................... .............................12
3.1 Compliance Requirements ............................................... .............................12
3.2 Noise Source Characteristics .......................................... .............................12
3.2.1 Parking Structure Activity
3.2.2 Dining Patio Activity.........
3.2.3 Mechanical Equipment.......
... 12
... 13
... 14
3.3 Noise Levels at Residences ............................................. .............................15
3.3.1 Uncontrolled Noise Levels
3.3.2 Noise Control Measures......
3.3.3 Controlled Noise Levels.....
... 15
... 16
... 17
4.0 References ............................................................ .............................18
Appendix — Calculation Worksheets ......................... .............................19
2
Mestre Greve Associates
Division of Landrum & Brown
LIST OF TABLES
Mariner's Pointe
Page ii
Table 1 City Of Newport Beach Noise Ordinance Standards .......................9
Table 2 Noise Measurement Results ..................... ............................... 11
Table 3 Maximum Noise Levels Generated By Parking Lots
(dBA at 50 feet) ..................................... ............................... 13
Table 4 Outdoor Condenser Unit Information ......... ............................... 14
Table 5 Kitchen Exhaust Fan (PCU) and Make Up Air Unit (MAU)
Information........................................... ............................... 15
Table 6 Uncontrolled Noise Levels .......................... .............................15
Table 7 Duct Silencers Assumed for Noise Control .. ............................... 16
Table 8 Minimum Required Duct Silencer Insertion Loss ......................... 16
Table 9 Controlled Noise Levels ........................... ............................... 17
LIST OF FIGURES
Figure1 Vicinity Map .............................................. ..............................2
Figure 2 Project Area ............................................. ..............................3
Figure 3 City of Newport Beach Noise Standards ........ ..............................7
Mestre Greve Associates
Division of Landrum & Brown
1.0 INTRODUCTION
Mariner's Pointe
The purpose of this report is to assess compliance with the City of Newport Beach Noise
Ordinance for the proposed Mariner's Pointe Project in the City of Newport Beach. The project
proposes the development of a retail development on the north side of Pacific Coast Highway
immediately west of Dover Drive. Figure 1 presents a vicinity map showing the location of the
project. Figure 2 presents an aerial photo of the project. The aerial photo shows that there are
residences located directly to the north of the project. These homes are located on bluff
overlooking the project site. The pad elevations of the homes are approximately 60 feet above
sea level. There are also residences to the south of the project across West Coast Highway at
approximately the same ground elevation of the project. The first level of the project is at an
elevation of 14.0 feet above sea level.
There are three sources of noise in the project that could generate noise levels exceeding the
City's Noise Ordinance that are examined. These three sources are; vehicle activities on the top
level of the proposed parking structure, activity on the dining patio on the second level of the
structure, and mechanical (HVAC) equipment. The locations of these noise sources are
indicated on Figure 2.
At the time the Initial Study /MND for the project (The Planning CenterlDC &E 2011) was
prepared the HVAC and other mechanical systems were to be installed in a fully enclosed
mechanical penthouse on the roof of the retail building with venting to the south towards West
Coast Highway. The noise levels generated by the equipment in this configuration was
determined to comply with the City's Noise Ordinance and the noise impact was determined to
be less than significant. As a result of project design revisions, the mechanical equipment area
will be covered with a screening wall rather than being enclosed in a penthouse. The screening
wall will visually obscure the equipment but will provide minimal sound attenuation due to
ventilation requirements for the mechanical equipment. The floor of the mechanical equipment
area will be sloped with a highest elevation of approximately 41.17 feet above sea level. The top
of mechanical area screening wall will be 49.0 feet above sea level.
The parking structure will include an exhaust fan. The outlet to the parking structure exhaust fan
is shown in Figure 2 and located at the northeast corner of the project site at the top level of the
parking structure. The top of the garage exhaust fan will be at an elevation of 53.33 feet.
This report analyzes the noise generated by project at the residences located above the project for
compliance with the City of Newport Beach Municipal Code Noise Ordinance. Section 2.0
presents background information on noise criteria and metrics, the noise criteria adopted by the
City of the Newport Beach, and the results of existing noise measurements. Noise levels
generated by operational activities at the project are analyzed and compared to the City's Noise
Ordinance in Section 3.0.
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Mestre Greve Associates
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Figure 1
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Mestre Greve Associates Mariner's Pointe
Division of Landrum & Brown Page 4
2.0 EXISTING SETTING
2.1 Background Information on Noise
2.1.1 Noise Criteria Background
Sound is technically described in terms of the loudness (amplitude) of the sound and frequency
(pitch) of the sound. The standard unit of measurement of the loudness of sound is the decibel
(dB). Decibels are based on the logarithmic scale. The logarithmic scale compresses the wide
range in sound pressure levels to a more usable range of numbers in a manner similar to the
Richter scale used to measure earthquakes. In terms of human response to noise, a sound 10 dB
higher than another is judged to be twice as loud; a sound 20 dB higher is perceived to be four
times as loud; and so forth. Everyday sounds normally range from 30 dB (very quiet) to 100 dB
(very loud).
Since the human ear is not equally sensitive to sound at all frequencies, a special frequency-
dependent rating scale has been devised to relate noise to human sensitivity. The A- weighted
decibel scale (dBA) performs this compensation by discriminating against frequencies in a
manner approximating the sensitivity of the human ear. Community noise levels are measured in
terms of the "A- weighted decibel," abbreviated dBA. Sound levels decrease as a function of
distance from the source as a result of wave divergence, atmospheric absorption and ground
attenuation. As the sound wave form travels away from the source, the sound energy is
dispersed over a greater area, thereby dispersing the sound power of the wave. Atmospheric
absorption also influences the levels that are received by the observer. The greater the distance
traveled, the greater the influence and the resultant fluctuations. The degree of absorption is a
function of the frequency of the sound as well as the humidity and temperature of the air.
Turbulence and gradients of wind, temperature and humidity also play a significant role in
determining the degree of attenuation. Intervening topography can also have a substantial effect
on the effective perceived noise levels.
Noise has been defined as unwanted sound and it is known to have several adverse effects on
people. From these known effects of noise, criteria have been established to help protect the
public health and safety and prevent disruption of certain human activities. This criterion is
based on known impacts of noise on people, such as hearing loss, speech interference, sleep
interference, physiological responses and annoyance. Each of these potential noise impacts on
people are briefly discussed in the following narratives:
HEARING LOSS is not a concern in community noise situations of this type. The
potential for noise induced hearing loss is more commonly associated with occupational
noise exposures in heavy industry or very noisy work environments. Noise levels in
neighborhoods, even in very noisy airport environs, are not sufficiently loud as to cause
hearing loss.
SPEECH INTERFERENCE is one of the primary concerns in environmental noise
problems. Normal conversational speech is in the range of 60 to 65 dBA and any noise in
this range or louder may interfere with speech. There are specific methods of describing
speech interference as a function of distance between speaker and listener and voice
level.
Mestre Greve Associates
Division of Landrum & Brown
Mariner's Pointe
Page 5
SLEEP INTERFERENCE is a major noise concern for traffic noise. Sleep disturbance
studies have identified interior noise levels that have the potential to cause sleep
disturbance. Note that sleep disturbance does not necessarily mean awakening from
sleep, but can refer to altering the pattern and stages of sleep.
PHYSIOLOGICAL RESPONSES are those measurable effects of noise on people that
are realized as changes in pulse rate, blood pressure, etc. While such effects can be
induced and observed, the extent is to which these physiological responses cause harm or
are signs of harm is presently unknown.
ANNOYANCE is the most difficult of all noise responses to describe. Annoyance is a
very individual characteristic and can vary widely from person to person. What one
person considers tolerable can be quite unbearable to another of equal hearing capability.
2.1.2 Noise Assessment Metrics
The description, analysis and reporting of community noise levels around communities is made
difficult by the complexity of human response to noise and the myriad of noise metrics that have
been developed for describing noise impacts. Each of these metrics attempts to quantify noise
levels with respect to community response. Most of the metrics use the A- Weighted noise level
to quantify noise impacts on humans. A- Weighting is a frequency weighting that accounts for
human sensitivity to different frequencies.
Noise metrics can be divided into two categories: single event and cumulative. Single -event
metrics describe the noise levels from an individual event such as an aircraft fly -over or perhaps
a heavy equipment pass -by. Cumulative metrics average the total noise over a specific time
period, which is typically 1 or 24 -hours for community noise problems. For this type of analysis,
cumulative noise metrics is typically used.
Several rating scales have been developed for measurement of community noise. These account
for: (1) the parameters of noise that have been shown to contribute to the effects of noise on
man, (2) the variety of noises found in the environment, (3) the variations in noise levels that
occur as a person moves through the environment, and (4) the variations associated with the time
of day. They are designed to account for the known health effects of noise on people described
previously. Based on these effects, the observation has been made that the potential for a noise to
impact people is dependent on the total acoustical energy content of the noise. A number of noise
scales have been developed to account for this observation. The two most predominate noise
scales are the: Equivalent Noise Level (LEQ) and the Community Noise Equivalent Level
(CNEL). These scales are described in the following paragraphs along with the Ldn and L(%)
scales that are also used for community noise assessment.
LEQ is the sound level corresponding to a steady -state sound level containing the same
total energy as a time - varying signal over a given sample period. LEQ is the "energy"
average noise level during the time period of the sample. LEQ can be measured for any
time period, but is typically measured for 1 hour. This 1 -hour noise level can also be
referred to as the Hourly Noise Level (HNL), the energy average of all the events and
background noise levels that occur during that time period.
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Mariner's Pointe
Page 6
CNEL, Community Noise Equivalent Level, is the predominant rating scale now in use
in California for land use compatibility assessment. The CNEL scale represents a time
weighted 24 -hour average noise level based on the A- weighted decibel. Time weighted
refers to the fact that noise that occurs during certain sensitive time periods is penalized.
The evening time period (7 p.m. to 10 p.m.) penalizes noises by 5 dBA, while nighttime
(10 p.m. to 7 a.m.) noises are penalized by 10 dBA. These time periods and penalties
were selected to reflect people's increased sensitivity to noise during these time periods.
A CNEL noise level may be reported as a "CNEL of 60 dBA," "60 dBA CNEL," or
simply "60 CNEL."
LDN, the day -night scale is similar to the CNEL scale except that evening noises are not
penalized. It is a measure of the overall noise experienced during an entire day. The time -
weighted refers to the fact that noise that occurs during certain sensitive time periods is
penalized. In the Ldn scale, those noise levels that occur during the night (10 pm to 7
am) are penalized by 10 dB. This penalty was selected to attempt to account for
increased human sensitivity to noise during the quieter period of a day, where resting at
home and sleep are the most probable activities.
L( %) is a statistical method of describing noise which accounts for variance in noise
levels throughout a given measurement period. L( %) is a way of expressing the noise
level exceeded for a percentage of time in a given measurement period. For example
since 5 minutes is 25% of 20 minutes, L(25) is the noise level that is equal to or exceeded
for five minutes in a twenty - minute measurement period. It is L( %) that is used for many
Noise Ordinance standards. For example, most daytime City, State and City Noise
Ordinances use an ordinance standard of 55 dBA for 30 minutes per hour or an L(50)
level of 55 dBA. In other words the Noise Ordinance states that no noise level should
exceed 55 dBA for more that fifty percent of a given period. The L( %) levels are not
used for the City of Noise Ordinance.
2.2 Noise Criteria
The Noise Ordinance and Noise Element of the General Plan contain the City's policies on noise.
The Noise Ordinance applies to noise on one property impacting a neighboring property.
Typically, it sets limits on noise levels that can be experienced at the neighboring property. The
Noise Ordinance is part of the City's Municipal Code and is enforceable throughout the City.
The Noise Element of the General Plan presents limits on noise levels from transportation noise
sources, vehicles on public roadways, railroads and aircraft. These limits are imposed on new
developments. The new developments must incorporate the measures to ensure that the limits
are not exceeded. The City of Newport Beach Noise Ordinance and Noise Element policies are
presented below in Sections 2.2.1 and 2.2.2.
2.2.1 City of Newport Beach Noise Element
The City of Newport Beach specifies outdoor and indoor noise limits for various land uses
impacted by transportation noise sources. The noise limits specified in the City's Noise Element
are in terms of the Community Noise Equivalent Level (CNEL). The standard states that for
residential and hospital land uses, the exterior noise exposure level shall not exceed 65 CNEL
and the interior noise exposure level shall not exceed 45 CNEL. Figure 3 presents the complete
Interior and exterior noise standards for contained in the City of Newport Beach Noise Element.
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Division of Landrum & Brown Page 8
2.2.2 City of Newport Beach Noise Ordinance
The City of Newport Beach's Noise Ordinance is presented in three sections of the municipal
code, Sections 10.26, 10.28, and 10.32. Section 10.28 "Loud and Unreasonable Noise" is what
is often referred to as a "Nuisance Ordinance" in that it does not contain any specific noise level
limits. It prohibits "the making, allowing, creation or maintenance of loud and unreasonable,
unnecessary, or unusual noises which are prolonged, unusual, annoying, disturbing and/or
unreasonable in their time, place and use are a detriment to public health, comfort, convenience,
safety, general welfare and the peace and quiet of the City and its inhabitants." The specific
provisions of Section 10.28 were substantially revised by the City in 2001 but the concept of the
section was unchanged. Sections 10.28.040 and 10.28.045 are relevant to the Project in that they
regulate construction noise and property maintenance noise. Effectively, these sections limit the
hours of these activities to daytime hours. Section 10.32 "Sound Amplifying Equipment"
regulates the use of sound amplification equipment and provides for permitting of sound
amplification equipment.
Section 10.26 is the most relevant to the Project as it presents specific standards for noise
generated on one property so that it does not significantly impact adjacent properties. This
section is summarized and the specific noise standards from the ordinance are presented below.
This section was adopted in 1995. Prior to that, the City had not established any specific sound
level limits.
Table 1 presents the Noise Ordinance standards presented in Section 10.26 of the City's
Municipal Code. The Noise Ordinance is applicable to noise generated from sources such as,
dining patios, parking lots, and mechanical equipment. The Noise Ordinance requirements
cannot be applied to mobile noise sources such as heavy trucks when traveling on public
roadways. Federal and State laws preempt control of the mobile noise sources on public roads.
However, the requirements can be applied to vehicles traveling on private property.
The City of Newport Beach exterior and interior noise criteria are given in terms of 15 minute
Leq and Lmax noise levels. The noise levels specified are those that are not to be exceeded at a
property from noise generated at a neighbor property. Noise levels are to be measured with A-
weighting and a slow time response. Greater noise levels are permitted during the day (7 a.m. to
10 p.m.) as compared to the nighttime period (10 p.m. to 7 a.m.). If the ambient noise level (i.e.,
the noise level without the offending source) exceeds the applicable standard the ambient noise
level becomes the standard.
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Mestre Greve Associates
Division of Landrum & Brown
Table 1
Citv Of Newport Beach Noise Ordinance Standards
Mariner's Pointe
Page 9
* Residential within 100' of a commercial property where noise is from said commercial property
If the ambient noise level exceeds the resulting standard, the ambient shall be the standard)
Section 10.26.055 "Noise Level Measurement" defines the locations where measurements can be
made to determine compliance with the noise standards. It effectively defines where the Noise
Ordinance standards are applicable. For residential areas, the exterior standard is applicable to
any part of a private yard, patio, deck or balcony normally used for human activity. The
standards are not applicable to non -human activity areas such as trash container storage areas,
planter beds, above or contacting a property line fence, or other areas not normally used as part
of the yard, patio, deck, or balcony. Interior noise standards are applicable anywhere inside the
room at least 4 feet from the walls, or within the frame of an open window.
Section 10.26.045 sets different noise standards for HVAC equipment. HVAC equipment "in or
adjacent to residential areas" cannot generate a noise level in excess of 50 dBA unless it includes
a timing device that will deactivate the equipment between 10:00 p.m, and 7:00 a.m. in which the
standard is raised to 55 dBA.
Section 10.26.35 "Exemptions" presents noise sources that are exempt from the provisions of the
City's Noise Ordinance. Item G of Section 10.26.035 exempts noise sources associated with the
maintenance of real property and instead requires that they be subject to Chapter 10.28 of the
Municipal Code. Section 10.28.45 sets limits on the times of day that any "tool, equipment or
machine" can be operated "in a manner which produces loud noise that disturbs, or could disturb,
a person of normal sensitivity who works or resides in the vicinity." Specifically, the section
restricts these activities to between 7:00 a.m. and 6:30 p.m. Monday through Friday, and
between 8:00 a.m. and 6:00 p.m. on Saturday. These activities are prohibited on Sundays and
federal Holidays.
2so
Noise Level Not To Be Exceeded
Zone
Noise Metric
7 a.m. to 10 p.m.
10 p.m. to 7 a.m.
(daytime)
(nighttime)
EXTERIOR NOISE STANDARDS
I Residential
Leq (15)
55 dBA
50 dBA
Lmax
75 dBA
70 dBA
II Commercial
Leq (15)
65 dBA
60 dBA
Lmax
85 dBA
80 dBA
III Mixed Use Residential*
Leq (15)
60 dBA
50 dBA
Lmax
80 dBA
70 dBA
IV Industrial/Manufacturing
Leq (15)
70 dBA
70 dBA
Lmax
90 dBA
90 dBA
INTERIOR NOISE STANDARDS
I Residential
Leq (15)
45 dBA
40 dBA
Lmax
65 dBA
60 dBA
III Mixed Use Residential*
Leq (15)
45 dBA
45 dBA
Lmax
65 dBA
65 dBA
* Residential within 100' of a commercial property where noise is from said commercial property
If the ambient noise level exceeds the resulting standard, the ambient shall be the standard)
Section 10.26.055 "Noise Level Measurement" defines the locations where measurements can be
made to determine compliance with the noise standards. It effectively defines where the Noise
Ordinance standards are applicable. For residential areas, the exterior standard is applicable to
any part of a private yard, patio, deck or balcony normally used for human activity. The
standards are not applicable to non -human activity areas such as trash container storage areas,
planter beds, above or contacting a property line fence, or other areas not normally used as part
of the yard, patio, deck, or balcony. Interior noise standards are applicable anywhere inside the
room at least 4 feet from the walls, or within the frame of an open window.
Section 10.26.045 sets different noise standards for HVAC equipment. HVAC equipment "in or
adjacent to residential areas" cannot generate a noise level in excess of 50 dBA unless it includes
a timing device that will deactivate the equipment between 10:00 p.m, and 7:00 a.m. in which the
standard is raised to 55 dBA.
Section 10.26.35 "Exemptions" presents noise sources that are exempt from the provisions of the
City's Noise Ordinance. Item G of Section 10.26.035 exempts noise sources associated with the
maintenance of real property and instead requires that they be subject to Chapter 10.28 of the
Municipal Code. Section 10.28.45 sets limits on the times of day that any "tool, equipment or
machine" can be operated "in a manner which produces loud noise that disturbs, or could disturb,
a person of normal sensitivity who works or resides in the vicinity." Specifically, the section
restricts these activities to between 7:00 a.m. and 6:30 p.m. Monday through Friday, and
between 8:00 a.m. and 6:00 p.m. on Saturday. These activities are prohibited on Sundays and
federal Holidays.
2so
Mestre Greve Associates Mariner's Pointe
Division of Landrum & Brown Page 10
2.3 Existing Noise Measurements
As discussed above, the City's Noise Ordinance contains a clause that if the ambient noise level
is greater than the applicable standards presented in Table 1 then the ambient noise level
becomes the applicable noise limit. To determine the ambient noise level at the homes north of
the project 24 -hour noise measurements were performed in the rear yard of a home directly north
of the project located at 311 Kings Road. The location of the noise measurement is shown in
Figure 2.
The noise measurement utilized a Bruel & Kjwr 2238 automated digital noise data acquisition
system. This instrument automatically calculates both the Equivalent Noise Level (LEQ) and
Percent Noise Level (L %) for any specific time period. The noise monitor was equipped with a
BrUel & KjTr 1/2 -inch electret microphone and was calibrated with a Bruel & Kjxr calibrator
with calibration traceable to the National Bureau of Standards before and after each
measurement. Calibration for the instrument is performed annually and is certified through the
duration of the measurements. This measurement system satisfies the ANSI (American National
Standards Institute) Standards 1.4 for Type 1 precision noise measurement instrumentation. The
monitor was set up to record the Leq noise levels every one second.
The City's Noise Ordinance noise level limits are in terms of the energy average noise level
during a 15 minute period (Leq(15)). Using the one second Leq levels recorded by the sound
level meter the running Leq(15) was calculated along with the hourly Leq (Leq(H)). Table 2
presents the results of the measurements. The highest and lowest Leq(15) during each hour and
is presented along with the Leq(H).
The ambient noise at the residences to the north of the project is primarily due to traffic on West
Coast Highway. The initial study prepared for the project (The Planning CenterlDC &E 2011)
shows that the structures proposed by the project will act as noise barriers reducing traffic noise
levels at these residences by as much as 6 dB. Therefore, with the project ambient noise levels
could be reduced by as much as 6 dB compared to conditions when the measurements were
made. Therefore, the minimum Leq(15) must be more than 6 dBA greater than the Noise
Ordinance Limits (60 dBA daytime and 50 dBA nighttime) to result in the ambient noise level
being greater than the applicable noise level limit. Measured levels more than 6 dBA greater
than the applicable standard are shown in italics in Table 2.
The data in Table 2 shows that the Min Leq(15) is more than 6 dBA greater than the nighttime
standard of 50 dBA during the 10:00 p.m. hour. However, the measured min Leq(15) is only 0.7
dBA greater than the limit. Adjusting the noise level limit is not appropriate however because
the difference is so small. Ambient noise levels during all other hours are expected to be less
than the Noise Ordinance limits after the project is constructed. Therefore, no adjustment to the
noise level limits due to ambient noise levels is warranted.
Mestre Greve Associates
Division of Landrum & Brown
Mariner's Pointe
Page it
Table 2
Noise Measurement Results
Max
Min
Hour
Leq(15)
Leq(H)
Leq(15)
12 PM
63.2
62.2
61.2
1 PM
63.0
62.3
60.8
2 PM
65.3
63.8
61.5
0
N 3 PM
63.3
62.0
61.2
a
N 4 PM
62.2
61.9
60.9
0
5 PM
62.2
61.7
61.2
6 PM
62.7
61.6
60.8
7 PM
62.4
61.0
60.1
8 PM
60.8
59.9
59.1
�.�. 9 PM
60.4
59.4
58.3
10 PM
58.6
57.6
56.7
11 PM
57.0
55.5
54.0
12 AM
56.4
53.4
50.8
1 AM
52.9
51.1
49.3
2 AM
50.5
48.6
46.9
3 AM
52.5
49.5
45.6
4 AM
52.1
49.9
45.9
0
N 5 AM
56.1
53.9
51.0
0
6 AM
60.7
58.9
55.5
AW 7 AM
64.1
62.5
60.7
8 AM
63.3
62.8
62.3
D 9 AM
62.8
61.9
61.3
10 AM
64.5
62.6
60.9
11 AM
65.4
63.4
61.5
12 PM
69.0
65.5
61.9
1 PM
616
62.6
61.7
2 PM
64.8
63.2
61.9
�2
Mestre Greve Associates
Division of Landrum & Brown
3.0 COMPLIANCE ANALYSIS
Mariner's Pointe
Page 12
This section examines the noise generated by the project and its compliance with the City's
Noise Ordinance at sensitive uses in the vicinity of the project. The primary noise sensitive use
near the project are the residences located on the bluff above and immediately north of the
project. There are residential uses located to the south of the project across West Coast
Highway.
The criterion that will be used to determine the compliance of the project is discussed in Section
3.1. The characteristics of the three noise sources of concern are discussed in Section 3.2. The
noise levels at the residences due to the noise sources of concern are discussed in Section 3.3 and
any noise control requirements are identified.
3.1 Compliance Requirements
The noise generated by the project is required to comply with the noise level limits specified in
City of Newport Beach Noise Ordinance presented previously in Section 2.2.2. The residences
in the vicinity of the project are within 100 feet of a commercial area. Therefore, noise levels
from the project are controlled by the Zone III Residential Mixed Use limits of an Leq(15) of 60
dBA and Lmax of 80 dBA during the daytime hours (7:00 a.m. to 10:00 p.m.) and an Leq(15) of
50 dBA and Lmax of 70 dBA during the nighttime hours (10:00 p.m. to 7:00 a.m.). Project
generated noise levels greater than these levels would not be in compliance.
3.2 Noise Source Characteristics
The subsections below describe the characteristics of the noise sources of concern associated
with the project and discuss the methodologies used to estimate noise levels at the residences.
3.2.1 Parking Structure Activity
The majority of the parking structure will be enclosed. The top floor of the parking structure will
be covered with a roof and there will be a continuous wall from the floor to the celling on the
north side of the structure. A section of the third floor parking area will be exposed at the south
side of the parking structure as indicated in Figure 2.
Traffic associated with parking lots and structures is typically not of sufficient volume to exceed
community noise standards that are based on a time averaged scale such as the CNEL or Leq
scale. However, the instantaneous maximum sound levels generated by car door slamming,
engine start-up, alarm activation and car pass -bys can be annoying to nearby residents. Tire
squeal may also be a problem depending on the type of parking surface. Estimates of the
maximum noise levels associated with some parking lot activities are presented in Table 3.
These levels are based on measurements conducted by Mestre Greve Associates. The noise
levels presented are for a distance of 50 feet from the source, and are the maximum noise level
generated. A range is given to reflect the variability of noise generated by various automobile
types and driving styles.
2 s
Mestre Greve Associates Mariner's Pointe
Division of Landrum & Brown Page 13
Table 3
Maximum Noise Levels Generated By Parking Lots
dBA at 50 feet
Event Lmax
Door Slam 60 to 70
Car Alarm Activation 65 to 70
Engine Start-up 60 to 70
Car pass -by 55 to 70
The elevation of the 3`d floor of the parking structure is 38.5 feet above sea level. The portion of
the third floor parking that is not covered is located approximately 60 feet from the north side of
the parking structure and the north side of the parking structure is approximately 27 feet from the
nearest residential outdoor living area for the residences to the north. The south side of the
parking structure is approximately 110 feet from the residential outdoor living areas to the south.
Noise from the parking lot was calculated using standard acoustical methodologies. The source
level was adjusted to account for attenuation due to geometric spreading (6 dB per doubling of
distance). For the residences to the north, the noise reduction provided by the parking area
enclosure (at least 20 dB) and the noise reduction provided by the enclosure acting as a noise
barrier for the portion of the parking structure that is not covered was accounted for. For the
residences to the south, the noise reduction of the 3.5' high wall along the edge of the parking
structure was accounted for. Leq(15) noise levels from parking activities were assumed to be 20
dB less than the maximum level.
3.2.2 Dining Patio Activity
The project includes three dining patios as indicated in Figure 2. On the east side of the building,
facing Dover Avenue there is an approximate 570 square foot dining patio on the first floor of
the retail buildings and an approximate 1,260 square foot dining patio on the second floor. On
the south side of the building, facing West Coast Highway there is an approximate 480 square
foot dining patio on the south side of the second level of the retail buildings. The occupancy of
the balconies was estimated based on 15 square feet per person and it was assumed that half the
occupants would be speaking at one time. Normal conversation levels generate a noise level
between 60 and 65 dBA at a distance of three feet. Maximum vocal effort will generate a noise
level 15 to 20 dB higher than normal conversation levels. The nearest residential outdoor living
area to the north is located approximately 123 feet from the patio area on the north side of the
building and 93 feet from the patios on the east side. Further the structure acts as a noise barrier
reducing noise levels from the patio to these residences by at least 15 dB. The nearest residential
living area to the south are located approximately 117 feet from the patio area on the north side
of the building and 158 feet from the patio areas on the south side of the building. Further, the
structure acts as a noise barrier reducing noise levels from the patios on the north side of the
building by at least 7 dB.
Noise from the dining patio was calculated using standard acoustical methodologies. The source
level was adjusted to account for attenuation due to geometric spreading (6 dB per doubling of
distance). The noise reduction provided by the structure discussed above was also accounted for.
Mestre Greve Associates
Division of Landrum & Brown
3.2.3 Mechanical Equipment
Mariner's Pointe
Page 14
Mechanical equipment that could generate considerable noise levels at the residences is located
in two areas on the roof of the project as shown in Figure 2. The first area, located at the
northwest corner of the building is the outlet duct of the garage exhaust fan. The second area is
the mechanical equipment area on the north side of the retail building.
The garage exhaust fan is specified to be a Lorence Cook 100 SQN. Sound generation
characteristics of this unit were obtained from the manufacturer. Sound power levels at the
outlet of this unit were calculated using the octave band source sound power levels and
methodology prescribed by the American Society of Heating, Air Conditioning and Refrigeration
(ASHRAE 2007). Sound pressure levels at the residences was calculated using methodology
prescribed in the Air Conditioning and Refrigeration Institute Standard 275 (ARI 2007). A
calculation worksheet is presented in the appendix that shows the details of the calculations.
The several types of noise generating equipment will be located in the mechanical equipment
area. This equipment includes nine outdoor condenser units, two make up air units, and three
kitchens exhaust fans with pollution control units. Note that the retail tenants of the building,
which have not been determined, will supply much of this equipment. To enable project design
specific units were assumed by the mechanical engineer for the project. The units assumed for
design are shown in Tables 4 and 5. Noise levels from the condenser units were calculated using
ARI Standard 275 and noise levels from the kitchen exhaust and makeup air units were
calculated using the same methodology as for the garage exhaust fan described above.
Calculation worksheets are presented in the appendix to show the detail of the calculations
Table 4
Outdoor Condenser Unit Information
Drawing
Symbol
Mfg
Model
Source Level
AC -103
Daikin
REYQ- 240 -PAYD (2)x120
63 dBA @ 3 feet
AC -201
Daikin
REYQ -72 -PAYD
58 dBA @ 3 feet
AC -101
Daikin
RFYQ -96 -PAYD
60 dBA @ 3 feet
AC -102
Daikin
RXYMQ -48 -PVJU
58 dBA @ 3 feet
AC -104
Daikin
RXYMQ -36 -PVJU
58 dBA @ 3 feet
AC -202
Daikin
RXYMQ -48 -PVJU
58 dBA @ 3 feet
AC -203.1
Daikin
RXYQ- 108 -PATJ
60 dBA @ 3 feet
AC -203.2
Daikin
RXYQ- 108 -PATJ
60 dBA @ 3 feet
AC -CU -E2
Daikin
38 MVC -12
54 dBA @ 3 feet
Mestre Greve Associates
Division of Landrum & Brown
Mariner's Pointe
Page 15
Table 5
Kitchen Exhaust Fan (PCU) and Make Up Air Unit (MAU) Information
Unit Mfg Model HP Fan Size
PCU 103 CaptiveAire KB25 15 25"
PCU 203.1 CaptiveAire KB25 15 25"
PCU 203.2
CaptiveAire
KB20
10
20"
MAU -103
CaptiveAire
A4- D1000920
7.5
20"
MAU -203
CaptiveAire
A5-D2000925
20
25"
3.3 Noise Levels at Residences
3.3.1 Uncontrolled Noise Levels
Using the information presented in Section 3.2 noise levels at the residences to the north and
south of the project site were calculated and the results are reported in Table 6. Worksheets in
the appendix show the details of the calculations. The projected Leq(15) and Lmax noise levels
for each noise source discussed above are presented. Note that the mechanical equipment
generates essentially a consistent level of noise and the Lmax level is equal to the Leq(15) noise
level.
Table 6
Uncontrolled Noise Levels
Noise Source
Residences to North
Leq(15) Lmax
Residences to South
Leq(15) Lmax
Dining Patios
1 st Floor East Side
38.0
40.2
41.4
43.6
2nd Floor East Side
36.2
40.2
39.6
43.6
2nd Floor South Side
29.5
37.7
44.9
53.2
Parking Garage
39.2
59.8
29.7
52.0
PCU Units
63.9
63.9
57.4
57.4
MAU Units
72.8
72.8
61.1
61.1
Condenser Units
45.4
45.4
33.7
33.7
Garage Exhaust Fan
46.7
46.7
32.9
32.9
Total Project Noise Level
73.3
72.8
62.7
61.1
Noise Ordinance Limit
50
70
50
70
Table 6 shows that without noise control measures the projected noise levels are greater than the
most stringent nighttime noise ordinance limit except for the Lmax level at the residences to the
south. Measures to reduce noise levels to comply with the City's Noise Ordinance are presented
below along with the resulting noise levels.
236
Mestre Greve Associates
Division of Landrum & Brown
3.3.2 Noise Control Measures
Mariner's Pointe
Page 16
Table 6 shows that without noise control measures the noise levels generated by the project will
exceed the nighttime noise limits. The mechanical equipment generates the highest noise levels.
There is no practical way to reduce the condenser unit noise levels when considering the
operational requirements of the units as well as project design limitations. The most effective
method to reduce noise levels is to insert a silencer duct between the fan units and the outlets of
the garage exhaust fan and PCU units and between the fan units and the inlets to the MAU Units.
The mechanical engineer for the project recommended considering silencers manufactured by
VibroAcoustics. Noise levels were recalculated with various models of silencers and the
silencers listed in Table 7 were determined to reduce noise levels to less than the applicable noise
limits. Note that the silencers used for the project are not required to be the specific make and
model shown in Table 7. Any silencers that provide the same amount of insertion loss will
perform equivalently. Table 8 shows the minimum required insertion loss required to adequately
reduce the noise levels of the units requiring silencers.
Table 7
Duct Silencers Assumed for Noise Control
Unit(s)
Manufacturer
Model
Length
Garage Exhaust (EF -2)
VibroAcoustics
RD -HV -F7
60"
PCU103, PCU 203. 1,
PCU 203.2
VibroAcoustics
RD -MV -Fl
84"
MAU -103, MAU -203
VibroAcoustics
RD -HV -Fl
84"
Table 8
Minimum Required Duct Silencer Insertion Loss
Octave Band Insertion Loss
Unit(s) 63 125 250 500 1000 2000 4000 8000
Garage Exhaust (EF -2)
PCU 103, PCU 203. 1,
PCU 203.2
MAU -103, MAU -203
13 26 29 23 16 II
11 20
30 36 25
23 25 18
19 15
16 13
2sl
Mestre Greve Associates
Division of Landrum & Brown
3.3.3 Controlled Noise Levels
Mariner's Pointe
Page 17
The noise levels at the nearby residences were recalculated with the noise control measures
described above. The results of these calculations are presented in Table 9. Worksheets
showing the details of the calculations are presented in the appendix.
Table 9
Controlled Noise Levels
Noise Source
Residences to North
Leq(15) Lmax
Residences to South
Leq(15) Lmax
Dining Patios
1st Floor East Side
38.0
40.2
41.4
43.6
2nd Floor East Side
36.2
40.2
39.6
43.6
2nd Floor South Side
29.5
37.7
44.9
53.2
Parking Garage
39.2
59.8
29.7
52.0
PCU Units
38.3
38.3
26.6
26.6
MAU Units
44.9
44.9
33.2
33.2
Condenser Units
45.4
45.4
33.7
33.7
Garage Exhaust Fan
35.2
35.2
21.4
21.4
Total Project Noise Level
49.8
59.8
47.8
53.2
Noise Ordinance Limit
50
70
50
70
Table 9 shows that noise levels generated by the project will be less than the most stringent
nighttime limits of the City of Newport Beach Municipal Code. As discussed above, much of
the mechanical equipment to be located on the roof of the retail building will be supplied and
installed by the tenants of the project who are currently not known. If the equipment supplied by
the tenants is substantially different from what was assumed for this analysis, a reassessment of
the noise generated by the project will be warranted.
232
Mestre Greve Associates
Division of Landrum & Brown
4.0 REFERENCES
Mariner's Pointe
Page IS
ARI. Standard 275 Application of Sound Rating Levels of Outdoor Unitary Equipment.
Arlington, VA: ARI, 2007.
ASHRAE. ASHRAE Hanbook -HVAC Applications, Chapter 47 Sound and Vibration Control.
Atlanta, GA: ASHRAE, 2007.
The Planning CenterlDC &E. Inital Study for Mariner's Pointe Project. Initial Study, Newport
Beach: City of Newport Beach, 2011.
239
Mestre Greve Associates
Division of Landrum & Brown
Mariner's Pointe
Page 19
APPENDIX - CALCULATION WORKSHEETS
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